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fc1b6d6de2
This commit offers an option to encrypt and authenticate all messaging,
including the neighbor discovery messages. The currently most advanced
algorithm supported is the AEAD AES-GCM (like IPSec or TLS). All
encryption/decryption is done at the bearer layer, just before leaving
or after entering TIPC.
Supported features:
- Encryption & authentication of all TIPC messages (header + data);
- Two symmetric-key modes: Cluster and Per-node;
- Automatic key switching;
- Key-expired revoking (sequence number wrapped);
- Lock-free encryption/decryption (RCU);
- Asynchronous crypto, Intel AES-NI supported;
- Multiple cipher transforms;
- Logs & statistics;
Two key modes:
- Cluster key mode: One single key is used for both TX & RX in all
nodes in the cluster.
- Per-node key mode: Each nodes in the cluster has one specific TX key.
For RX, a node requires its peers' TX key to be able to decrypt the
messages from those peers.
Key setting from user-space is performed via netlink by a user program
(e.g. the iproute2 'tipc' tool).
Internal key state machine:
Attach Align(RX)
+-+ +-+
| V | V
+---------+ Attach +---------+
| IDLE |---------------->| PENDING |(user = 0)
+---------+ +---------+
A A Switch| A
| | | |
| | Free(switch/revoked) | |
(Free)| +----------------------+ | |Timeout
| (TX) | | |(RX)
| | | |
| | v |
+---------+ Switch +---------+
| PASSIVE |<----------------| ACTIVE |
+---------+ (RX) +---------+
(user = 1) (user >= 1)
The number of TFMs is 10 by default and can be changed via the procfs
'net/tipc/max_tfms'. At this moment, as for simplicity, this file is
also used to print the crypto statistics at runtime:
echo 0xfff1 > /proc/sys/net/tipc/max_tfms
The patch defines a new TIPC version (v7) for the encryption message (-
backward compatibility as well). The message is basically encapsulated
as follows:
+----------------------------------------------------------+
| TIPCv7 encryption | Original TIPCv2 | Authentication |
| header | packet (encrypted) | Tag |
+----------------------------------------------------------+
The throughput is about ~40% for small messages (compared with non-
encryption) and ~9% for large messages. With the support from hardware
crypto i.e. the Intel AES-NI CPU instructions, the throughput increases
upto ~85% for small messages and ~55% for large messages.
By default, the new feature is inactive (i.e. no encryption) until user
sets a key for TIPC. There is however also a new option - "TIPC_CRYPTO"
in the kernel configuration to enable/disable the new code when needed.
MAINTAINERS | add two new files 'crypto.h' & 'crypto.c' in tipc
Acked-by: Ying Xue <ying.xue@windreiver.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
168 lines
6.4 KiB
C
168 lines
6.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/**
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* net/tipc/crypto.h: Include file for TIPC crypto
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*
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* Copyright (c) 2019, Ericsson AB
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef CONFIG_TIPC_CRYPTO
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#ifndef _TIPC_CRYPTO_H
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#define _TIPC_CRYPTO_H
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#include "core.h"
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#include "node.h"
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#include "msg.h"
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#include "bearer.h"
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#define TIPC_EVERSION 7
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/* AEAD aes(gcm) */
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#define TIPC_AES_GCM_KEY_SIZE_128 16
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#define TIPC_AES_GCM_KEY_SIZE_192 24
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#define TIPC_AES_GCM_KEY_SIZE_256 32
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#define TIPC_AES_GCM_SALT_SIZE 4
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#define TIPC_AES_GCM_IV_SIZE 12
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#define TIPC_AES_GCM_TAG_SIZE 16
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/**
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* TIPC crypto modes:
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* - CLUSTER_KEY:
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* One single key is used for both TX & RX in all nodes in the cluster.
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* - PER_NODE_KEY:
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* Each nodes in the cluster has one TX key, for RX a node needs to know
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* its peers' TX key for the decryption of messages from those nodes.
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*/
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enum {
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CLUSTER_KEY = 1,
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PER_NODE_KEY = (1 << 1),
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};
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extern int sysctl_tipc_max_tfms __read_mostly;
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/**
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* TIPC encryption message format:
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*
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* 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
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* 1 0 9 8 7 6 5 4|3 2 1 0 9 8 7 6|5 4 3 2 1 0 9 8|7 6 5 4 3 2 1 0
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* w0:|Ver=7| User |D|TX |RX |K| Rsvd |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* w1:| Seqno |
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* w2:| (8 octets) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* w3:\ Prevnode \
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* / (4 or 16 octets) /
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* \ \
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* / Encrypted complete TIPC V2 header and user data /
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* \ \
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* | AuthTag |
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* | (16 octets) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Word0:
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* Ver : = 7 i.e. TIPC encryption message version
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* User : = 7 (for LINK_PROTOCOL); = 13 (for LINK_CONFIG) or = 0
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* D : The destined bit i.e. the message's destination node is
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* "known" or not at the message encryption
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* TX : TX key used for the message encryption
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* RX : Currently RX active key corresponding to the destination
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* node's TX key (when the "D" bit is set)
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* K : Keep-alive bit (for RPS, LINK_PROTOCOL/STATE_MSG only)
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* Rsvd : Reserved bit, field
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* Word1-2:
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* Seqno : The 64-bit sequence number of the encrypted message, also
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* part of the nonce used for the message encryption/decryption
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* Word3-:
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* Prevnode: The source node address, or ID in case LINK_CONFIG only
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* AuthTag : The authentication tag for the message integrity checking
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* generated by the message encryption
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*/
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struct tipc_ehdr {
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union {
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struct {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 destined:1,
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user:4,
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version:3;
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__u8 reserved_1:3,
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keepalive:1,
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rx_key_active:2,
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tx_key:2;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 version:3,
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user:4,
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destined:1;
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__u8 tx_key:2,
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rx_key_active:2,
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keepalive:1,
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reserved_1:3;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__be16 reserved_2;
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} __packed;
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__be32 w0;
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};
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__be64 seqno;
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union {
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__be32 addr;
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__u8 id[NODE_ID_LEN]; /* For a LINK_CONFIG message only! */
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};
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#define EHDR_SIZE (offsetof(struct tipc_ehdr, addr) + sizeof(__be32))
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#define EHDR_CFG_SIZE (sizeof(struct tipc_ehdr))
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#define EHDR_MIN_SIZE (EHDR_SIZE)
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#define EHDR_MAX_SIZE (EHDR_CFG_SIZE)
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#define EMSG_OVERHEAD (EHDR_SIZE + TIPC_AES_GCM_TAG_SIZE)
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} __packed;
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int tipc_crypto_start(struct tipc_crypto **crypto, struct net *net,
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struct tipc_node *node);
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void tipc_crypto_stop(struct tipc_crypto **crypto);
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void tipc_crypto_timeout(struct tipc_crypto *rx);
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int tipc_crypto_xmit(struct net *net, struct sk_buff **skb,
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struct tipc_bearer *b, struct tipc_media_addr *dst,
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struct tipc_node *__dnode);
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int tipc_crypto_rcv(struct net *net, struct tipc_crypto *rx,
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struct sk_buff **skb, struct tipc_bearer *b);
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int tipc_crypto_key_init(struct tipc_crypto *c, struct tipc_aead_key *ukey,
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u8 mode);
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void tipc_crypto_key_flush(struct tipc_crypto *c);
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int tipc_aead_key_validate(struct tipc_aead_key *ukey);
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bool tipc_ehdr_validate(struct sk_buff *skb);
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#endif /* _TIPC_CRYPTO_H */
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#endif
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